| 以混合表面活性剂为模板可控合成MCM-48和MCM-41分子筛 |
| Controlled Synthesis of Mesoporous Silicas MCM-48 and MCM-41 by Using Mixed Templates |
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| 摘要: 利用阳离子和三嵌段共聚物混合表面活性剂为模板,在水热条件、碱性介质中可控合成出MCM-48和MCM-41分子筛。在固定P123(聚氧乙烯-聚氧丙烯-聚氧乙烯三嵌段共聚物)：TEOS(正硅酸乙酯)(物质的量的比)为0.018 75的体系中，调节CTAB(十六烷基三甲基溴化铵)∶TEOS(正硅酸乙酯)物质的量比值m，当m在0.12~0.13范围合成出MCM-48分子筛；当m在0.04~0.08范围合成出MCM-41分子筛。通过XRD，TEM，N2物理吸附，IR等方法进行了表征。结果表明：聚氧乙烯-聚氧丙烯-聚氧乙烯三嵌段共聚物(P123)的加入可以更大程度地降低合成介孔材料所需阳离子表面活性剂的用量；可控合成的介孔材料具有高比表面积、高度有序的孔道结构、较集中的孔径分布。 |
| 关键词: 混合表面活性剂 可控合成 MCM-48 MCM-41 |
| 基金项目: |
| Abstract: Mesoporous silica MCM-48 and MCM-41 were hydrothermally synthesized in alkaline medium by using mixed cationic-nonionic triblock copolymer surfactant(P123, 2-methyloxirane; oxirane; CAS No. 9003-11-6)as template. By altering the ratio of CTAB(cetyltriethylammonium bromide) to TEOS(tetraethoxysilane , tetraethyl silicate), the mesoporous molecular sieves were obtained with different structures. The amount of CTAB can be largely decreased by adding P123 into the synthesis system. It is found that the molar ratios of CTAB/TEOS between 0.12 and 0.13 are favorable for the formation of highly ordered MCM-48 mesostructure and that of CTAB/TEOS between 0.04 and 0.08 are favorable for the formation of highly ordered MCM-41 mesostructure. XRD, TEM and N2 sorption measurements show that the products have highly ordered mesostructure with high surface area, large pore volume and narrow pore size distribution. |
| Keywords: mixed surfactants controlled synthesis MCM-48 MCM-41 |
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| 谷桂娜,王小青,孙伟杰,王素艳,刘春艳.以混合表面活性剂为模板可控合成MCM-48和MCM-41分子筛[J].无机化学学报,2010,26(1):13-16. |
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